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Copy pathgen-icache.c
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820 lines (752 loc) · 22.7 KB
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/* The IGEN simulator generator for GDB, the GNU Debugger.
Copyright 2002-2019 Free Software Foundation, Inc.
Contributed by Andrew Cagney.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "misc.h"
#include "lf.h"
#include "table.h"
#include "filter.h"
#include "igen.h"
#include "ld-insn.h"
#include "ld-decode.h"
#include "gen.h"
#include "gen-semantics.h"
#include "gen-idecode.h"
#include "gen-icache.h"
static void
print_icache_function_header (lf *file,
const char *basename,
const char *format_name,
opcode_bits *expanded_bits,
int is_function_definition,
int nr_prefetched_words)
{
lf_printf (file, "\n");
lf_print__function_type_function (file, print_icache_function_type,
"EXTERN_ICACHE", " ");
print_function_name (file,
basename, format_name, NULL,
expanded_bits, function_name_prefix_icache);
lf_printf (file, "\n(");
print_icache_function_formal (file, nr_prefetched_words);
lf_printf (file, ")");
if (!is_function_definition)
lf_printf (file, ";");
lf_printf (file, "\n");
}
void
print_icache_declaration (lf *file,
insn_entry * insn,
opcode_bits *expanded_bits,
insn_opcodes *opcodes, int nr_prefetched_words)
{
print_icache_function_header (file,
insn->name,
insn->format_name,
expanded_bits,
0 /* is not function definition */ ,
nr_prefetched_words);
}
static void
print_icache_extraction (lf *file,
const char *format_name,
cache_entry_type cache_type,
const char *entry_name,
const char *entry_type,
const char *entry_expression,
char *single_insn_field,
line_ref *line,
insn_field_entry *cur_field,
opcode_bits *expanded_bits,
icache_decl_type what_to_declare,
icache_body_type what_to_do)
{
const char *expression;
opcode_bits *bits;
char *reason;
ASSERT (format_name != NULL);
ASSERT (entry_name != NULL);
/* figure out exactly what should be going on here */
switch (cache_type)
{
case scratch_value:
if ((what_to_do & put_values_in_icache)
|| what_to_do == do_not_use_icache)
{
reason = "scratch";
what_to_do = do_not_use_icache;
}
else
return;
break;
case compute_value:
if ((what_to_do & get_values_from_icache)
|| what_to_do == do_not_use_icache)
{
reason = "compute";
what_to_do = do_not_use_icache;
}
else
return;
break;
case cache_value:
if ((what_to_declare != undef_variables)
|| !(what_to_do & put_values_in_icache))
{
reason = "cache";
what_to_declare = ((what_to_do & put_values_in_icache)
? declare_variables : what_to_declare);
}
else
return;
break;
default:
abort (); /* Bad switch. */
}
/* For the type, default to a simple unsigned */
if (entry_type == NULL || strlen (entry_type) == 0)
entry_type = "unsigned";
/* look through the set of expanded sub fields to see if this field
has been given a constant value */
for (bits = expanded_bits; bits != NULL; bits = bits->next)
{
if (bits->field == cur_field)
break;
}
/* Define a storage area for the cache element */
switch (what_to_declare)
{
case undef_variables:
/* We've finished with the #define value - destory it */
lf_indent_suppress (file);
lf_printf (file, "#undef %s\n", entry_name);
return;
case define_variables:
/* Using direct access for this entry, clear any prior
definition, then define it */
lf_indent_suppress (file);
lf_printf (file, "#undef %s\n", entry_name);
/* Don't type cast pointer types! */
lf_indent_suppress (file);
if (strchr (entry_type, '*') != NULL)
lf_printf (file, "#define %s (", entry_name);
else
lf_printf (file, "#define %s ((%s) ", entry_name, entry_type);
break;
case declare_variables:
/* using variables to define the value */
if (line != NULL)
lf_print__line_ref (file, line);
lf_printf (file, "%s const %s UNUSED = ", entry_type, entry_name);
break;
}
/* define a value for that storage area as determined by what is in
the cache */
if (bits != NULL
&& single_insn_field != NULL
&& strcmp (entry_name, single_insn_field) == 0
&& strcmp (entry_name, cur_field->val_string) == 0
&& ((bits->opcode->is_boolean && bits->value == 0)
|| (!bits->opcode->is_boolean)))
{
/* The cache rule is specifying what to do with a simple
instruction field.
Because of instruction expansion, the field is either a
constant value or equal to the specified constant (boolean
comparison). (The latter indicated by bits->value == 0).
The case of a field not being equal to the specified boolean
value is handled later. */
expression = "constant field";
ASSERT (bits->field == cur_field);
if (bits->opcode->is_boolean)
{
ASSERT (bits->value == 0);
lf_printf (file, "%d", bits->opcode->boolean_constant);
}
else if (bits->opcode->last < bits->field->last)
{
lf_printf (file, "%d",
bits->value << (bits->field->last - bits->opcode->last));
}
else
{
lf_printf (file, "%d", bits->value);
}
}
else if (bits != NULL
&& single_insn_field != NULL
&& strncmp (entry_name,
single_insn_field,
strlen (single_insn_field)) == 0
&& strncmp (entry_name + strlen (single_insn_field),
"_is_",
strlen ("_is_")) == 0
&& ((bits->opcode->is_boolean
&& ((unsigned)
atol (entry_name + strlen (single_insn_field) +
strlen ("_is_")) == bits->opcode->boolean_constant))
|| (!bits->opcode->is_boolean)))
{
/* The cache rule defines an entry for the comparison between a
single instruction field and a constant. The value of the
comparison in someway matches that of the opcode field that
was made constant through expansion. */
expression = "constant compare";
if (bits->opcode->is_boolean)
{
lf_printf (file, "%d /* %s == %d */",
bits->value == 0,
single_insn_field, bits->opcode->boolean_constant);
}
else if (bits->opcode->last < bits->field->last)
{
lf_printf (file, "%d /* %s == %d */",
(atol
(entry_name + strlen (single_insn_field) +
strlen ("_is_")) ==
(bits->
value << (bits->field->last - bits->opcode->last))),
single_insn_field,
(bits->
value << (bits->field->last - bits->opcode->last)));
}
else
{
lf_printf (file, "%d /* %s == %d */",
(atol
(entry_name + strlen (single_insn_field) +
strlen ("_is_")) == bits->value), single_insn_field,
bits->value);
}
}
else
{
/* put the field in the local variable, possibly also enter it
into the cache */
expression = "extraction";
/* handle the cache */
if ((what_to_do & get_values_from_icache)
|| (what_to_do & put_values_in_icache))
{
lf_printf (file, "cache_entry->crack.%s.%s",
format_name, entry_name);
if (what_to_do & put_values_in_icache) /* also put it in the cache? */
{
lf_printf (file, " = ");
}
}
if ((what_to_do & put_values_in_icache)
|| what_to_do == do_not_use_icache)
{
if (cur_field != NULL)
{
if (entry_expression != NULL && strlen (entry_expression) > 0)
error (line,
"Instruction field entry with nonempty expression\n");
if (cur_field->first == 0
&& cur_field->last == options.insn_bit_size - 1)
lf_printf (file, "(instruction_%d)", cur_field->word_nr);
else if (cur_field->last == options.insn_bit_size - 1)
lf_printf (file, "MASKED%d (instruction_%d, %d, %d)",
options.insn_bit_size,
cur_field->word_nr,
i2target (options.hi_bit_nr, cur_field->first),
i2target (options.hi_bit_nr, cur_field->last));
else
lf_printf (file, "EXTRACTED%d (instruction_%d, %d, %d)",
options.insn_bit_size,
cur_field->word_nr,
i2target (options.hi_bit_nr, cur_field->first),
i2target (options.hi_bit_nr, cur_field->last));
}
else
{
lf_printf (file, "%s", entry_expression);
}
}
}
switch (what_to_declare)
{
case define_variables:
lf_printf (file, ")");
break;
case undef_variables:
break;
case declare_variables:
lf_printf (file, ";");
break;
}
ASSERT (reason != NULL && expression != NULL);
lf_printf (file, " /* %s - %s */\n", reason, expression);
}
void
print_icache_body (lf *file,
insn_entry * instruction,
opcode_bits *expanded_bits,
cache_entry *cache_rules,
icache_decl_type what_to_declare,
icache_body_type what_to_do, int nr_prefetched_words)
{
/* extract instruction fields */
lf_printf (file, "/* Extraction: %s\n", instruction->name);
lf_printf (file, " ");
switch (what_to_declare)
{
case define_variables:
lf_printf (file, "#define");
break;
case declare_variables:
lf_printf (file, "declare");
break;
case undef_variables:
lf_printf (file, "#undef");
break;
}
lf_printf (file, " ");
switch (what_to_do)
{
case get_values_from_icache:
lf_printf (file, "get-values-from-icache");
break;
case put_values_in_icache:
lf_printf (file, "put-values-in-icache");
break;
case both_values_and_icache:
lf_printf (file, "get-values-from-icache|put-values-in-icache");
break;
case do_not_use_icache:
lf_printf (file, "do-not-use-icache");
break;
}
lf_printf (file, "\n ");
print_insn_words (file, instruction);
lf_printf (file, " */\n");
/* pass zero - fetch from memory any missing instructions.
Some of the instructions will have already been fetched (in the
instruction array), others will still need fetching. */
switch (what_to_do)
{
case get_values_from_icache:
break;
case put_values_in_icache:
case both_values_and_icache:
case do_not_use_icache:
{
int word_nr;
switch (what_to_declare)
{
case undef_variables:
break;
case define_variables:
case declare_variables:
for (word_nr = nr_prefetched_words;
word_nr < instruction->nr_words; word_nr++)
{
/* FIXME - should be using print_icache_extraction? */
lf_printf (file,
"%sinstruction_word instruction_%d UNUSED = ",
options.module.global.prefix.l, word_nr);
lf_printf (file, "IMEM%d_IMMED (cia, %d)",
options.insn_bit_size, word_nr);
lf_printf (file, ";\n");
}
}
}
}
/* if putting the instruction words in the cache, define references
for them */
if (options.gen.insn_in_icache)
{
/* FIXME: is the instruction_word type correct? */
print_icache_extraction (file, instruction->format_name, cache_value, "insn", /* name */
"instruction_word", /* type */
"instruction", /* expression */
NULL, /* origin */
NULL, /* line */
NULL, NULL, what_to_declare, what_to_do);
}
lf_printf (file, "\n");
/* pass one - process instruction fields.
If there is no cache rule, the default is to enter the field into
the cache */
{
insn_word_entry *word;
for (word = instruction->words; word != NULL; word = word->next)
{
insn_field_entry *cur_field;
for (cur_field = word->first;
cur_field->first < options.insn_bit_size;
cur_field = cur_field->next)
{
/* Always expand named fields (even if constant), so
references are valid. */
if (cur_field->type == insn_field_string)
{
cache_entry *cache_rule;
cache_entry_type value_type = cache_value;
line_ref *value_line = instruction->line;
/* check the cache table to see if it contains a rule
overriding the default cache action for an
instruction field */
for (cache_rule = cache_rules;
cache_rule != NULL; cache_rule = cache_rule->next)
{
if (filter_is_subset (instruction->field_names,
cache_rule->original_fields)
&& strcmp (cache_rule->name,
cur_field->val_string) == 0)
{
value_type = cache_rule->entry_type;
value_line = cache_rule->line;
if (value_type == compute_value)
{
options.warning (cache_rule->line,
"instruction field of type `compute' changed to `cache'\n");
cache_rule->entry_type = cache_value;
}
break;
}
}
/* Define an entry for the field within the
instruction */
print_icache_extraction (file, instruction->format_name, value_type, cur_field->val_string, /* name */
NULL, /* type */
NULL, /* expression */
cur_field->val_string, /* insn field */
value_line,
cur_field,
expanded_bits,
what_to_declare, what_to_do);
}
}
}
}
/* pass two - any cache fields not processed above */
{
cache_entry *cache_rule;
for (cache_rule = cache_rules;
cache_rule != NULL; cache_rule = cache_rule->next)
{
if (filter_is_subset (instruction->field_names,
cache_rule->original_fields)
&& !filter_is_member (instruction->field_names, cache_rule->name))
{
char *single_field =
filter_next (cache_rule->original_fields, "");
if (filter_next (cache_rule->original_fields, single_field) !=
NULL)
single_field = NULL;
print_icache_extraction (file, instruction->format_name, cache_rule->entry_type, cache_rule->name, cache_rule->type, cache_rule->expression, single_field, cache_rule->line, NULL, /* cur_field */
expanded_bits,
what_to_declare, what_to_do);
}
}
}
lf_print__internal_ref (file);
}
typedef struct _form_fields form_fields;
struct _form_fields
{
char *name;
filter *fields;
form_fields *next;
};
static form_fields *
insn_table_cache_fields (insn_table *isa)
{
form_fields *forms = NULL;
insn_entry *insn;
for (insn = isa->insns; insn != NULL; insn = insn->next)
{
form_fields **form = &forms;
while (1)
{
if (*form == NULL)
{
/* new format name, add it */
form_fields *new_form = ZALLOC (form_fields);
new_form->name = insn->format_name;
filter_add (&new_form->fields, insn->field_names);
*form = new_form;
break;
}
else if (strcmp ((*form)->name, insn->format_name) == 0)
{
/* already present, add field names to the existing list */
filter_add (&(*form)->fields, insn->field_names);
break;
}
form = &(*form)->next;
}
}
return forms;
}
extern void
print_icache_struct (lf *file, insn_table *isa, cache_entry *cache_rules)
{
/* Create a list of all the different instruction formats with their
corresponding field names. */
form_fields *formats = insn_table_cache_fields (isa);
lf_printf (file, "\n");
lf_printf (file, "#define WITH_%sIDECODE_CACHE_SIZE %d\n",
options.module.global.prefix.u,
(options.gen.icache ? options.gen.icache_size : 0));
lf_printf (file, "\n");
/* create an instruction cache if being used */
if (options.gen.icache)
{
lf_printf (file, "typedef struct _%sidecode_cache {\n",
options.module.global.prefix.l);
lf_indent (file, +2);
{
form_fields *format;
lf_printf (file, "unsigned_word address;\n");
lf_printf (file, "void *semantic;\n");
lf_printf (file, "union {\n");
lf_indent (file, +2);
for (format = formats; format != NULL; format = format->next)
{
lf_printf (file, "struct {\n");
lf_indent (file, +2);
{
cache_entry *cache_rule;
char *field;
/* space for any instruction words */
if (options.gen.insn_in_icache)
lf_printf (file, "instruction_word insn[%d];\n",
isa->max_nr_words);
/* define an entry for any applicable cache rules */
for (cache_rule = cache_rules;
cache_rule != NULL; cache_rule = cache_rule->next)
{
/* nb - sort of correct - should really check against
individual instructions */
if (filter_is_subset
(format->fields, cache_rule->original_fields))
{
char *memb;
lf_printf (file, "%s %s;",
(cache_rule->type == NULL
? "unsigned"
: cache_rule->type), cache_rule->name);
lf_printf (file, " /*");
for (memb =
filter_next (cache_rule->original_fields, "");
memb != NULL;
memb =
filter_next (cache_rule->original_fields, memb))
{
lf_printf (file, " %s", memb);
}
lf_printf (file, " */\n");
}
}
/* define an entry for any fields not covered by a cache rule */
for (field = filter_next (format->fields, "");
field != NULL; field = filter_next (format->fields, field))
{
cache_entry *cache_rule;
int found_rule = 0;
for (cache_rule = cache_rules;
cache_rule != NULL; cache_rule = cache_rule->next)
{
if (strcmp (cache_rule->name, field) == 0)
{
found_rule = 1;
break;
}
}
if (!found_rule)
lf_printf (file, "unsigned %s; /* default */\n", field);
}
}
lf_indent (file, -2);
lf_printf (file, "} %s;\n", format->name);
}
lf_indent (file, -2);
lf_printf (file, "} crack;\n");
}
lf_indent (file, -2);
lf_printf (file, "} %sidecode_cache;\n",
options.module.global.prefix.l);
}
else
{
/* alernativly, since no cache, emit a dummy definition for
idecode_cache so that code refering to the type can still compile */
lf_printf (file, "typedef void %sidecode_cache;\n",
options.module.global.prefix.l);
}
lf_printf (file, "\n");
}
static void
print_icache_function (lf *file,
insn_entry * instruction,
opcode_bits *expanded_bits,
insn_opcodes *opcodes,
cache_entry *cache_rules, int nr_prefetched_words)
{
int indent;
/* generate code to enter decoded instruction into the icache */
lf_printf (file, "\n");
lf_print__function_type_function (file, print_icache_function_type,
"EXTERN_ICACHE", "\n");
indent = print_function_name (file,
instruction->name,
instruction->format_name,
NULL,
expanded_bits, function_name_prefix_icache);
indent += lf_printf (file, " ");
lf_indent (file, +indent);
lf_printf (file, "(");
print_icache_function_formal (file, nr_prefetched_words);
lf_printf (file, ")\n");
lf_indent (file, -indent);
/* function header */
lf_printf (file, "{\n");
lf_indent (file, +2);
print_my_defines (file,
instruction->name,
instruction->format_name, expanded_bits);
print_itrace (file, instruction, 1 /*putting-value-in-cache */ );
print_idecode_validate (file, instruction, opcodes);
lf_printf (file, "\n");
lf_printf (file, "{\n");
lf_indent (file, +2);
if (options.gen.semantic_icache)
lf_printf (file, "unsigned_word nia;\n");
print_icache_body (file,
instruction,
expanded_bits,
cache_rules,
(options.gen.direct_access
? define_variables
: declare_variables),
(options.gen.semantic_icache
? both_values_and_icache
: put_values_in_icache), nr_prefetched_words);
lf_printf (file, "\n");
lf_printf (file, "cache_entry->address = cia;\n");
lf_printf (file, "cache_entry->semantic = ");
print_function_name (file,
instruction->name,
instruction->format_name,
NULL, expanded_bits, function_name_prefix_semantics);
lf_printf (file, ";\n");
lf_printf (file, "\n");
if (options.gen.semantic_icache)
{
lf_printf (file, "/* semantic routine */\n");
print_semantic_body (file, instruction, expanded_bits, opcodes);
lf_printf (file, "return nia;\n");
}
if (!options.gen.semantic_icache)
{
lf_printf (file, "/* return the function proper */\n");
lf_printf (file, "return ");
print_function_name (file,
instruction->name,
instruction->format_name,
NULL,
expanded_bits, function_name_prefix_semantics);
lf_printf (file, ";\n");
}
if (options.gen.direct_access)
{
print_icache_body (file,
instruction,
expanded_bits,
cache_rules,
undef_variables,
(options.gen.semantic_icache
? both_values_and_icache
: put_values_in_icache), nr_prefetched_words);
}
lf_indent (file, -2);
lf_printf (file, "}\n");
lf_indent (file, -2);
lf_printf (file, "}\n");
}
void
print_icache_definition (lf *file,
insn_entry * insn,
opcode_bits *expanded_bits,
insn_opcodes *opcodes,
cache_entry *cache_rules, int nr_prefetched_words)
{
print_icache_function (file,
insn,
expanded_bits,
opcodes, cache_rules, nr_prefetched_words);
}
void
print_icache_internal_function_declaration (lf *file,
function_entry * function,
void *data)
{
ASSERT (options.gen.icache);
if (function->is_internal)
{
lf_printf (file, "\n");
lf_print__function_type_function (file, print_icache_function_type,
"INLINE_ICACHE", "\n");
print_function_name (file,
function->name,
NULL, NULL, NULL, function_name_prefix_icache);
lf_printf (file, "\n(");
print_icache_function_formal (file, 0);
lf_printf (file, ");\n");
}
}
void
print_icache_internal_function_definition (lf *file,
function_entry * function,
void *data)
{
ASSERT (options.gen.icache);
if (function->is_internal)
{
lf_printf (file, "\n");
lf_print__function_type_function (file, print_icache_function_type,
"INLINE_ICACHE", "\n");
print_function_name (file,
function->name,
NULL, NULL, NULL, function_name_prefix_icache);
lf_printf (file, "\n(");
print_icache_function_formal (file, 0);
lf_printf (file, ")\n");
lf_printf (file, "{\n");
lf_indent (file, +2);
lf_printf (file, "/* semantic routine */\n");
if (options.gen.semantic_icache)
{
lf_print__line_ref (file, function->code->line);
table_print_code (file, function->code);
lf_printf (file,
"error (\"Internal function must longjump\\n\");\n");
lf_printf (file, "return 0;\n");
}
else
{
lf_printf (file, "return ");
print_function_name (file,
function->name,
NULL,
NULL, NULL, function_name_prefix_semantics);
lf_printf (file, ";\n");
}
lf_print__internal_ref (file);
lf_indent (file, -2);
lf_printf (file, "}\n");
}
}